Boots – shoes – and leggings
Patent
1978-12-14
1980-07-15
Smith, Jerry
Boots, shoes, and leggings
364745, G06F 1534, G06F 748
Patent
active
042131871
ABSTRACT:
Limit cycles are eliminated in digital filters driven by zero, d.c. and period 2 inputs, by adjusting the filter output in response to the state variables present within the filter. The filter includes a quantizer (201) adapted to provide a fixed length output word p in response to an input y, where p<y<p+k and k is the quantizer step size. The filter is further arranged to form the products a.multidot.X.sub.n and b.multidot.X.sub.n, where a and b are multiplier coefficients and X.sub.n and X.sub.n-1, the state variables, are once and twice delayed versions of the filter output X.sub.n+1, and to combine the aforesaid products and the filter input U.sub.n to yield the value y. In accordance with the invention, the quantizer output is adjusted to p+k, if
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patent: 4034196 (1977-07-01), Butterweck et al.
patent: 4034197 (1977-07-01), Lawrence et al.
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Digital Signal Processing Handbook, J. R. Mick, Advanced Micro Devices, Inc., 1976, pp. 28-40.
"Suppression of Parasitic Oscillations . . . Rounding Arithmetic", _H. Butterweck, AEU, Elect. & Commun., Band 29, 1975, pp. 371-374.
"A Novel Approach . . . Quantization Noise", M. Buttner, Proc. 1976 IEEE Intl. Symp. Circuits & Systems, pp. 291-294.
"Conrol of Limit Cycle Osc . . . Random Quantization", V. B. Lawrence et al., IEEE Trans. on A.S.S.P., Apr. 1978, pp. 127-134.
"Suppression of Parasitic Oscillations . . . Filters", A. Fettweis et al., IEEE Trans. on Circ. & Systems, Mar. 1975, pp. 239-246.
Lawrence Victor B.
Mitra Debasis
Bell Telephone Laboratories Incorporated
Freedman Barry H.
Smith Jerry
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